Machine for boring connecting rods



Oct. 21,-1952 E. A. ARP ,6 ,4

MACHINE FOR BORING CONNECTING RODS Filed Sept. 13, 1950 4 Sheets-Sheet 1 L m '[II ]N VEN TOR. 41 0 ,4. MP

A TTORNE )1 Oct. 21, 1952 a A. ARP 2,614,442

MACHINE FOR ,BORING CONNECTING RODS Filed Sept. 13, 1950 4 Sheets-Sheet 2 INVENTOR.

fVWLD 14. A171 BY fi'k 73W Arm 5):

Oct. 21, 1952 E. A. ARP 2,614,442

' MACHINE FOR BORING CONNECTING RODS Filed Sept. 13, 1950 4 Sheets-Sheet s INVEN TOR.

ATTORNEY Oct. 21, ,1952 E ARP 2,614,442

MACHINE FOR BORING CONNECTING RODS Filed Sept. 13, 1950 4 Sheets-Sheet 4 -36 2s a s3 25 INVENTOR.

5 W419 A AR/ 27 32 H-fiB/WMZ Patented Oct. 21, 1952 rFicE v 2,614,442 MACHINEFQR BORING CONNECTING Eons" Ewald A.v Arp, Mimieapolis,v Mining assigncrto Tobin-Arp ManufacturinggComp'any, Minne apolis, Minn., a corporation of Minnesota Application September 13, 1950, Serial No. 124,636

16 Claims. (01, IF-62) This application isa cdntiniiaticn in part of my pending application's Serial No. 4;4=,442, for Self Ali ning Bearing, filed August 16, 1948, and Serial No. 63,691, for Machine for Boring'Connecting Rods, filed December 6; 1948', now Patent No. 2,573,532, issued- October 30, 1-951, and presents additional novel and improved features and characteristics.

The invention hereinhas relation to a machine which has been devised to be especially usefulfor boring the bearings of connecting rods for crank shafts and wrist pins.

In the accompanying drawings forming a part of this specification, I

Fig. 1 is a side elevational view,- partially insection and partially broken away, of a machine made according to the invention;

Fig. 2 is an endelevation of the machine as it would appear from the right in Fig. 1;

Fig. 3 is a horizontal sectional view, taken on line 33 in Fig. 1, parts being omitted;

Fig. 4 is a detail sectional view of a self alinirig bearing of the machine; taken on line 44 in Fi 1;

5" isan end elevationalview" of the self alining' bearing disclosed in Fig. 4' as it would appear'from the right; I

Fig. 6" is a sectional view; taken on line S -5 in Fig. 4; I

Fig. 7' is a detail sectional view, taken online 'l-1 in- Fig. 1;

Fig. 8 is adetailsectional view, taken on line 8-84-11 Fig. 3; and

Fig, 9 is an eievationai View detailing areplaceable supporting element of the machine.-

A frame 10 of the machine is constituted as I so: that the rectilinear slab will be horizontally disposed.

Spaced apart, parallel boring bar supporting units, indicated: H: and (2,, respectively, are situated upon afiat upper surface. l3 of the frame I0 forv slidably adjustable movement: toward andaway from each: other, and said supporting units include seli-alinin'g bearings, representedl4 and [5,. respectively, adapted to be situated in alined relatiori'in. a single, desirably horizontal, plane tobe capable of selectively receiving a boring bar with cutting tool, or a locating rod; or mandrel Hi. The suppcrti-ngfunits I l and- I2- are keyed tdtheframe H), as at H, for slight'rocking movement ahorizontal. plane.

The self-alining bearings l d: and l25= are duplicates.v Each includes a stationary housing [8 constituted asa part of the corresponding boring bar supportingunit, a cage 19 within the see I tionary housing I8, a plurality of blocks, four asdisclosed, each denoted 20 within the cage, a retainer ring 21 for the cage, a lock nut 22 for the retainer ring, and a take-up ring 23 fer the blocks The housing 18 of each self-alini'n'g bearingisconstituted asan annular member open at one of its ends, its left end. as shown in Fig. 4 of the drawings, and provided at its opposite end with an interiorly extending annular'fiange 24. The annular flange '24 provides spaced apart, interiorly facing, arc shape bearing surfaces, four as shown, each represented '25, spaced degrees apart, and said annularfiange is cut away, as indicated atiii, at locations between adjacent are shape bearing surfaces 25; There are are shape bearing surfaces 25' diametrically opposite each other; and alsomcut-out portions 26' diametrically opposite each other. The are shape bearingsurfaces 25 are all in a single spherical surface and ma single plane indirection transversely of the longitudinal axis of the stationary housing l8.

The cage I9 is constituted as a hollowed out part-spherical member having externally facing arc shape bearing-surfaces, four as shown, each designated '27, spaced at 90' degrees apart, and the external surface of said cage is cut away,.'as at 28, at. locations between adjacent arc shape bearing surfaces 21. There is an arc shape bearing surface 21 engaged'with each of the arc shape bearing surfaces 25, and said are shape bearing surfaces- 21 are all in a single spherical surface which'is in fact the same spherical sur-i extending annular flange 24 are in alined rela' tionin the direction of the longitudinal axis" ofthe cage I9. An external surface 29 of the re tainer ring'at an inner part thereof is of cylindrical configuration to, besnugly slidable inward'-" ly and outwardly along" an. internalcylindrical surface of'the'housinglt at and adjacent to its open end, andan internal surface of said retainer Stated otherwise, said retainer ring 2i and" internally ring provides arc shape bearing surfaces 39. There is an arc shape bearing surface 3|] engaged with each of the arc shape bearing surfaces 21, and said retainer ring 2| is cut away, as indicated at 3!, at locations between adjacent arc shape bearing surfaces 3|]. Said are shape bearing surfaces 38 are all in a single spherical plane which is in fact the same spherical surface as that in which the arc shape bearing surfaces 25 and 21 are situated.

Screw bolts 32, extending through and having their heads countersunk in the interiorly extending annular flange 24 and engaged in interiorly threaded openings 33 extending through the retainer ring 2|, are for adjusting said retainer ring inwardly and outwardly, toward and away from said interiorly extending annular flange, and for maintaining the retainer ring in position to cause the arc shape bearing surfaces 25, 21 and 30, 2], respectively, to be in engaged relation. There are four screw bolts 32 in the disclosure as made, and said screw bolts are in alined relation to and equally spaced from the longitudinal axis of the cage IS.

The outer end portion of the retainer ring 2| includes an external thread 34, and the lock nut 22 has an internal thread 35 adapted to be turned down upon said external thread 34 until said lock nut is engaged against the open, adjacent end of the housing l8 to cause the retainer ring 2| to be secured against the possibility of turning movement. The lock nut 22 will be situated loosely on the retainer ring 2| until said retainer ring is adjusted to its intended and proper position, and after adjustment of saidretainer ring is accomplished, said lock nut will be turned down against the housing l8.

The interiorly extending annular flange 24 and the retainer ring 2| will, in cooperation with each other, maintain the cage [9 in the housing I8 against the possibility of displacement of said cage from said housing, and it will be apparent that the cage i9 is mounted in the housing it to be capable of rocking in any direction, by reason of the engagement of the arc shape bearing surfaces 27 with the arc shape bearing surfaces 25 and 30.

' The hollowed out part-spherical member or cage I9 is constructed at its interior to provide rectilinear slots, four as shown, each denoted 35, extending longitudinally of said hollowed out part-spherical member or cage, and there is a block within each of said longitudinally extending slots 36. The blocks 29 are bearing elements of each self alining bearing, and the longitudinally extending slots 36 are disposed at ninety degrees apart, there being longitudinally extending slots 36, 36 disposed diametrically opposite each other in direction transversely of each hollowed out part-spherical member or cage 19. The longitudinally extending slots 36 are contiguous with a central passageway 31 through the hollowed out part-spherical member or cage is for freely receiving a shaft, such as the locating rod or mandrel IE, or a boring bar, to be supported in the oppositely disposed self-alining is disposed in oblique relation to the longitudinal axis of the corresponding cage and extends exteriorly of said cage in direction from the corresponding internally extending annular flange 26 toward the corresponding retainer ring 2|, and at its opposite sides by spaced, parallel surfaces 45, 48 which are disposed radially of said corresponding cage. Also, each fiat camming surface 39 lies in a plane which is perpendicular to the planes including the spaced apart, parallel surfaces 49, 40 bounding the corresponding rectilinear slot 3'6.

The bios-ks or hearing elements of each self alining hearing are of duplicate construction. Each block or bearing element is bounded at its exterior side by a flat cainming surface ii, en-

7 gaged against and slidable over the flat cambearings, and each longitudinally extending slot 38 is disposed radially of the longitudinal axis of the corresponding hollowed out part-spherical member or cage.

The longitudinally extending, radially disposed rectilinear slots 35 in the cage of each self alining bearing are all of the same size and configuration or construction. Each is bounded at its base or exterior by a fiat camming surfac :5 Wh

ming surface 35) bounding the base or exterior of the rectilinear slot 3"; containing the corresponding block or bearing element, at its opposite sides by spaced apart, parallel surfaces 42, 42 engaged against and slidable over the spaced apart, parallel surfaces 48, 49- bounding the opposite sides of the corresponding rectilinear slot,

and at its interior side by a part-cylindrical bearing surface 43 disposed longitudinally of the cage iEandadapted to he engaged against a shaft, such as the locating rod or mandrel H5, or a boring bar, when disposed in the self-alining bearings. The construction and arrangement are such that the blocks or hearing elements 29 can be adjusted along the rectilinear slots 3% in one direction, toward the right in Fig. 4, to cause the part-cylindrical bearing surfaces 33 to be moved inwardly toward, and in opposite direction, towardthe left in said Fig. 4,.to cause said partcylindrioal bearing surfaces to be moved outwardly away from shafts such as [6. The partcylindrical bearing surfaces can be made to lie in a single cylindrical surface concentric with the longitudinal axis of the cage IQ of the corresponding self-alining hearing by adjustment of the blocks or hearing elements 2%) to positions Where all of said blocks or hearing elements are equi-distantly spaced from said longitudinal axis of said cage. Each block or bearing element 23 tapers in direction from the retainer ring end of the corresponding self alining bearing toward the endthereof having the interiorlyextending annular flange 2 The smaller end of each block or bearing element is bounded by a flat surface perpendicular tothe longitudinal axis of the corresponding cage ld, as is also the adjacent end of said cage, and the larger end of each block or bearing element is bounded by a fiat surface i l perpendicular to said longitudinal axis of the corresponding cage.

Each cage, 59 includes a cylindrical extension $5 at the end thereof opposite the interiorly extending annular flange 24 which is in surrounding relation to the blocks or hearing elements and projects beyond the large ends of said blocks or hearing elements at the corresponding end of each selfalining hearing. The cylindrical extension 55 of each cage it; includes an internal thread 16 which receives an external thread il upon the take-up ring 23 for the blocks or hearing elements 23. Each take-up ring is bounded at its inner end'by an annular surface 48 disposed in a plane perpendicular to the longitudinal axis of the corresponding cage i9 and parallel and. alined with and disposed outwardly of each of the flat surfaces 441. The take-up ring 23 is rotatably adjustable in the cylindrical extension 45 to cause all of the blocks or hearing elements 211 to be simultaneously forced inwardly of. the corre-' sponding cage thus to cause said blocks or bearing elements to be concurrently adjusted interiorlyof said cage to equal extent. The take-up rings of course will preclude removal of the blocks or bearing elements from the corresponding ends of the cages l9.

Locking screw bolts for the blocks or bearing elements 20 are each indicated 49. Each block or bearing element includes an internally threaded transverse opening 50 alined with a slot 51 contiguous with and extending radially outwardly from a rectilinear slot 36. Each radial slot 5| is of dimension substantially equal tothe diameter of each internally threaded opening 50 in direction circumferentially of the corresponding cage 19 and of greater dimension in the direction of the longitudinal axis of said corresponding cage. That is each radial slot 5| is elongated in direction lengthwise of the corresponding cage 19. There is a locking screw bolt 49 for each block or bearing element 20. The locking screw bolts and extend freely through the radial slots 5|, are threaded into the transverse openings 50 and have their heads disposed in concavities 52 in the external surfaces of the cages IS. The locking screw bolts when turned home obviously will fasten the blocks or bearing elements 20 in fixed relation to the cages 19-. Said locking screw bolts of course will be loose during adjustment of said blocks or bearing elements by manipulation of the take-up rings 23, and after adjustment of the blocks or bearing elements is accomplished, the locking screw bolts will be turned home. Evidently, the take-up ring and locking screw boltswill in cooperation fixedly retain said blocks or bearing elements in any adjusted position to which set. Elongated radial slots such as 5! are for the obvious purpose of permitting adjustment of the blocks or bearing elements 20 longitudinally of the cages [9 while the locking A locating rod or mandrel, or a boring bar,

supported by the units H and I? will be situated within the cage of each of self-alining. alined bearings and supported by and engaged with part-cylindrical bearing surfaces such as. 43 of the blocks or hearing elements. 2-0 of each supporting unit. The cage I9 and said blocks or bearing elements of each bearing are constituted as a. unitary structure when the blocks: or bearing' elements after adjusted are secured the rectilinear slots 36 by the take-up ring. and. the locking screw bolts in the manner as above set forth. The part-spherical bearing surfaces and of the interiorly extending annular flange 24 and the retainer ring 21,. respectively, of each bearing. engage the part-spherical bearing sur faces 21 of the corresponding cage t9 at? spaced apart locations so that; each cage i-s-retained within its corresponding. hou-singlfl against the possibility of accidentalv displacement and can have rocking. movement in any direction. Each. cage. l9 and the unit with which it: is joined, comprised as a housing 18 and aretainer ring 6. 2|, are connected as. are the united elements of a universal joint so that-each cage is mounted for swinging movement in any direction thus to permit the part-cylindrical bearing surfaces 43 to become readily and easily longitudinally alined with a shaft such as H5 in any self-alining bearings made according to the principles of the invention.

The cut-away portions 26, 28 and 3! in the interiorly extending annular flange 21, the cage. i9 and the retainer ring 21, respectively, of each self-alining bearing are provided to the end that each cage can be removable from and insertable in its corresponding housing while the corresponding retainer ring is inassembled, position. To remove a cage it is merely necessary to rotate it. ninety degrees from its operative position, and the cages can be replaced by reversal of the movement employed to remove them.

The boring bar supporting units H and i2 can be of duplicate construction. Each: is-constituted as an elongated generally rectilinear member disposed in perpendicularrelation to the frame H), as well as in perpendicular relation to a locating rod or mandrel, or a boring bar, when situated in the self-alining bearings l4 and I5. A flat lower surface of each boring bar supporting unit rests upon the flat upper surface [3 of said frame It for slidable movement thereover, and the boring bar supporting units are adapted to be locked down against said flat upper surface: l3 in a manner forming no part of the present invention.

The machine incorporates adjustable units for supporting and clamping articles bearings of which are to be bored, an adjustablev article supporting unit of said machine being represented generally at 54, and one of adjustable article clamping units of the machine being indicated generally at The adjustable clamping units and the manner in which they are operative form no part of the present invention.

The adjustable article supporting unit 54 includes a vertical slide column 5% which is rigidly supported, as at 51, upon the body of the machineand extends upwardly therefrom at a side of the boring bar supporting units H and i2. The vertical slide column 56 has a longitudinally extending slot 58. e

A holder 59, adjustable longitudinally of the vertical slide column 58 and adapted to be secured in fixed relation thereto, is constituted as a tubular element 69 slidable along said column and a supporting member 6| pivotally mounted upon the tubular element for swinging movement in a vertical plane and disposed both interiorly andv exteriorly of the column. The holder 59 is adapted to be fixed on. the slide column 56. at any elevation to which adjusted through the medium of a lock bar 6-2 and a lock screw 63. Thelock bar 62 includes offset end portions 66 having openings which receive screw bolts 65 adapted to be turned into the: tubular element 60 and. a transverse rib 66 at its central portion disposedv inthe longitudinally extending slot 58,. and the lock screw 63 is situated in a protuberance 61 upon said tubular element and adapted to be turned down against a surface of the lock bar 62. directly opposite its transverse rib; 66.- The construction and arrangement are such that the tubular element 60 will be fixed upon the yen-- tical slide column 56 against rotational and longitudinal movement when the loclt's'crew 6:3. turned down against. the lock bar 62', and. also such that said tubular element can be adjusted upwardly and downwardly along said vertical slide column when said lock screw is withdrawn from said lock bar.

The supporting member 6| is constituted as a U-shape frame disposed at elevation above a locating rod or mandrel, such as H5, or a boring bar, when in the self-alining bearings l4 and I5, as well as parallel to the frame ID. Said supporting member or U-shape frame consists of spaced, parallel arms 88, 68 at opposite sides of the tubular element 6|! and extending both interiorly and exteriorly therefrom and a base element 69 disposed exteriorly of said tubular element interconnecting said spaced, parallel arms. Interior end portions of the spaced, parallel arms 68, 68 provide locating rod or mandrel receiving portions of the supporting member 6| disposed interiorly of the tubular element Bil in parallel relation to and directly above the self-alining bearings l4 and IS.

The tubular element 6E integrally or rigidly supports spaced, parallel lugs 10, 10, situated at the interior side of said tubular element, as well as at opposite sides thereof, in cut-out portions of the parallel arms 68, B8, and said parallel arms are pivotally mounted, as at 1|, 1|, upon said parallel lugs for swinging or rocking movement of the supporting member or U-shaped frame Si in a vertical plane. Said supporting member or U-shape frame is counterbalanced to swing downwardly by gravity at its interior side, and a vertical adjusting screw 72 in a ledge 13 rigid with and extending exteriorly from an upper portion of the tubular element 60 is adapted to be turned down against an upper surface of the base element 69 thus to limit the extent to which the interior end portion of the supporting member or U-shape frame can swing downwardly.

The tubular element 50 integrally or rigidly includes vertically spaced bosses l4, 14 with the outer ends of which interior surfaces l5, 15, between the lug 16 at the corresponding side of the supporting member or U-shape frame Si and the base element 69, of one of the arms 68 are engaged, and mechanism is included for clamping said mentioned arm against said bosses, thus to render said tubular element and supporting member or U-shape frame a rigid structure. More explicitly stated, the tubular element integrally supports an internally threaded element TB, between the vertically spaced bosses M, 14, an outwardly bowed leaf spring Ti against an exterior surface of the arm 68 to be clamped against said tubular element, and a clamping screw includes an externally threaded body 18 extending through a hollowed out portion of said arm and turnable in said threaded element and a head 19 engaged against said outwardly bowed leaf spring. Evidently, the tubular element 66 and the supporting member or U- shape frame 6| will be made rigid with each other in response to inward turning of the clamping screw, and said supporting member or U-shape frame will be freed for swinging or rocking movement relative to said tubular element in response to outward turning of said clamping screw.

Each of the locating rod or mandrel receiving portions of the supporting member or U-shape frame provides a pair of spaced, part-cylindrical engaging surfaces 8B for a locating rod or mandrel. The construction and arrangement are such that the part-cylindrical engaging surfaces 80 of the locating rod or mandrel receiving portions provided by the diiferent arms 68 of the supporting member or U-shape frame BI is situated are situated in alinedrelation and parallel to and above a locating rod or mandrel when in the self-alining bearings M and I5, and all of the engaging surfaces desirably can face interiorly. Stated otherwise, the part-cylindrical engaging surfaces 80 face in direction away from the tubular element 6!], and, as shown, said engaging surfaces are in a vertical plane including the self-alining bearings. The parallel arms 68, 68 are, in the disclosure as made, situated inwardly of the boring bar supporting units II and I2. The part-cylindrical engaging surfaces 88 of each of the locating rod or mandrel receiving portions together extend through an are approaching 180 degrees.

In Fig. 1 of the drawings, a locating rod or mandrel receiving portion there shown removably supports replaceable supporting elements 8|, 8|, shown in detail in Fig. 9, and said replaceable supporting elements include internal part-cylindrical engaging surfaces 32 which support a locating rod or mandrel Each replaceable supporting element 8| includes an external part-cylindrical engaging surface to be engaged against one of the part-cylindrical engaging surfaces 86, as well as an internal partcylindrical engaging surface 82 to be engaged by a locating rod or mandrel. Each supporting element 8| is removably retainable in its operative position by a resilient member 85 with hook 86 to be engaged back of a pin 8? upon the corresponding arm 58. The engaging surfaces 82 are employed in Fig. l by reason of the fact that the locating rod or mandrel there shown is supporting the wrist pin end of a connecting rod 88. In an instance when the crank shaft end of a connecting rod is to be supported, the larger engaging surfaces 8|] are to be employed.

Each of the spaced, parallel arms 68, E8 of the supporting member or U-shape frame 6| sup ports a locating rod or mandrel retainer 558, and said retainers are of duplicate construction. Each includes an L-lever 90 having a substan-- tially horizontal upper arm thereof pivotally mounted, as at 9|, upon an inner, upper part of the end portion of the corresponding arm 68 adjacent the end thereof opposite the tubular element 6|] for swinging movement of the L-lever in the vertical plane of said corresponding arm. A substantially vertical lower arm of each L-lever 90 rigidly supports a retaining element 92 situated at the inner, lower end of the vertical arm adapted to be engaged against a surface of a locating rod or mandrel, such as 83, onposite surfaces thereof rested upon engaging surfaces such as 82 of the replaceable supporting elements 8|, or Bil of the parallel arms 68, thus to retain the locating rod or mandrel in seated position.

Each L-lever 80 is resiliently urged normally to swing in direction away from the corresponding arm 68 through the instrumentality of a curled spring 33 upon the corresponding pivotal support 9| and a pin 94 rigid with said corresponding arm, and mechanism is'included for releasably locking each L-lever at an inwardly swung position, against force of the correspond ing curled spring 93 tending to swing the L-lever outwardly, with the corresponding retaining element 92 engaged against a locating rod or mandrel seated on engaging surfaces such as 86 or 82.

An oblique locking device 95 of each retainer 89, extending downwardly and inwardly through a cut-out portion of the horizontal upper arm of the corresponding L-lever 90, is constituted as a corresponding arm 68.

threaded rod 96 extending through and slidable in a transverse pin 9"l rotatably mounted in said to retain the tubular element 98 aga'inst the transverse pin 91 and theknurled finger piece 99 against said tubular element liiachlocking' device 95 is supported by its'transverse pinf97 for swinging movement in a vertical plane upon the I A leaf spring we rigid'with as; tar-mitt} is'engaged against a surface of the free e'ndjpart of the enlarged extension portion"l90 upon "the threaded rod BBofthe corresponding locking device 95 opposite'the correspondingnotchl 01 normally to resiliently urgesa'id large extension .po'rtion toward a cross pin I04 rigid'with said corresponding arm. The construc'tion'a'n'd arrangement will be suchthat when either. L-lever' 90' is at an inwardly swung position with'the corresponding retaining element'9'2' engaged againsta locating rod or mandrel, the corresponding cross pin lfl i'can be engaged in the notch lfl'lin the corresponding enlarged extension portion loil'by reason of resilient force exerted by the corresponding leaf spring 13. Stated otherwise; each of the locking devices 95 ca'n'be" pushed downwardly and inwardly to cause thecorresponding L lever to be swung inwardly from an" outward position andbecome locked in an inward position,

drels which vary in diameter. When a locating rod or mandrel to be engaged is of larger diameter, the knurled finger pieces 99 will be turned indirection to increase the overall lengths of the locking, devices 95, and with increase in length of said locking devices the compression coil springs I92 yet will retain the tubular elements "98 against the transverse pins 9'! and the knurled linger pieces '99 against said tubular elements. when a locating rod or mandrel to be engaged is of smaller diameter, the knurled finger pieces 99 will 'be' turned in direction to decrease the overall lengths of the locking devices 95, and with decrease inlength of said locking devices said coil springs til-2 will be compressed.

I In"the accoinplishment-of practical operation of the' ma'c'h-ine, the boring bar supporting units H and i2 will'be setup on the frame it in spaced relation'to each other a desired distance apart, at opposite sides or the clamping units, and fastened clown ori' said frame in" a manner forming no par't'of the'present' invent-ioni The tubular elemerit-6B of the holder 59' will be adjusted along where the corresponding retaining element 92 is engaged against a locating-rod or nandrel by reason of engagement oi the ccnfrespon'ding cross pin 14 in the corresponding rectilinear notch i0 l and each L-levencan'bereleased firom its inward ly swung and locked position in response toupward swinging jmoveniientbi the finger piece 99 of the corresponding lo in M QYYi eW 9 a ain t resilient force of the correspondingleaf spring "I93, thus to permit the corresponding curled spring 93 to cause theverticalarmof said, L- lever and the retaining element thereonto ,be swung to an outward position, Stop pins l llfi on the arms 68, in adjacent relation-to the enlarged extension portions mat the lower sides thereof, are for precluding possibility of downward swingmg movement of said enlarged extension portions a distance causing these to be removed-from their engaged relationiwith the leaf "springs; I 03,

' 'In the instance of each retainer 8 9-,. the curled spring -93 tends to urge the corresponding L-lever to swing to its outward position wherethe corre sponding retaining element; 92 is in remoterelaa.

tion to "its 'locatinglrod or mandrel supporting position. The loclging devices 95 retain the L- levers at their inwardly swung positions where the retaining elements '9 2are engaged against a locating rod or mandie wnen thecro'ss pins IM arein the notches .l 0'! The'jobvious purpose foruse'of the construction'jand arrangement including thecompression coiliiWIi i S" lllzis-iso' that the';retai ning elements l S'Z'can be'engag'ed against" locating rods or 'manthe vertical slide column 56 to situate the supporting'members or U-shape frames 6i at a selected elevation predetermined by the length of a connecting -rod to'berebo'red, and said supporting member or U-shape frarne will be rotatably adjusted, by employment'of the vertical adjustin screw -'E2, to accurately set the part-cylindrical engaging surfaces Bitor 82-; at their proper elevation. After rotatable adjustment of the supporting member-QT U' shape' frame is accomplished} the head "i9' of the clamping screw will be turned to 'ca'uses'a'id clamping screw to render the tubular elementiiil' and said supporting member or U-shape frame'rigid the one withtheother. One end of a connecting rod either the Wrist pin end'orthe crank -shaft end, having a-bearing to be bored, willbe placed: between the diiferent space paral'lel armsfid til-and the part-cylindriaging' lsurfaces 89, "89 thereof, or the part- ,cyli drical 'ei gag'ing' surfaces 82, 82 thereon, aloicating rod for 'niaridrcl will be inserted through the; .endjf of g the ccnnect'in'grod, between said arms" '68, I68, and i'izes'td in and upon said partcylindrical engag ng; surfaces; and the retainin elements "92 will 'beias'te'nedfdown against said locating rod-"or. mandrel. T..Th"e other {end of said connestingrod; eitherthefcrank shaft end or he wri -rm. end Wi -1: 9 a ed b t e urp rtin fun t i I and t and? l a i mdl r mandrel wi l .beinserted in and through tn jseifrg imin b ari s 1. J5 en th end of th nectinglrod between said supporting units, v As disclos dithe wrist-pin end orthe n c ns o 88 is fitted uponxthe upper. locatingl-rodl'or mandrel 83 and the crank shaft endisJbetWeenJt-he. sup:

porting units Ill vand i.'2.. .Thisislthe set upuwhen i l, I 5 to; be gras ped after. the connecting .rod has be'enfitted .upjqnfthe.upp'er and lower locating ,7 p U I wil-I'be secuieddown e i i nd e se tr e; an ne r u per iocating'rou's' 6r mandrels in response to ee -e4 2 manipulation of the locking devices 925 in the manner as hereinbefore set forth.

The lower locating rod or mandrel will be removed from the bearing of a connecting rod to be rebored after the connecting rod is set up in the machine, and a boring bar with appropriate cutting tool will be set up in the self-aiming bearings of the supporting units H and i2 and actuated to accomplish a boring operation upon a bearing of said connecting rod, of course while the upper end of the connecting rod is supported upon the upper locating rod or mandrel and the lower end is clamped in the machine.

What is claimed is:

1. In a machine for centering and alining with respect to each other a connecting rod bearing to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, supporting units on said frame, and alined bearings on said supporting units, respectively, adapted selectively to removably receive a locating element or a boring bar for insertion through a bearing to be rebored of said connecting rod while situated between said supporting units, each of said bearings including a hollowed out cage having a longitudinally extending central passageway and radial slots disposed outwardly of and in contiguous relation to said central passageway, circumferentially spaced bearing elements in said radial slots having interiorly facing bearing surfaces of part-cylindrical configuration disposed longitudinally of said cage and means for adjusting said bearing elements interiorly and exteriorly of said cage, there being clearance openings between the bearing elements of each of said bearings extending longitudinally through the corresponding cage in contiguous relation to its central passageway.

2. In a machine for centering and alining with respect to each other a connecting rod bearing to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, supporting units on said frame, and alined bearings on said supporting units, respectively, adapted selectively to removably receive a locating rod or a boring bar for insertion through a bearing to be rebored of a connecting rod, while situated between said supporting units, each of said bearings including a hollowed out cage having a longitudinally extending central passageway and F radial slots disposed outwardly of and in contiguous relation to said central passageway each bounded at its exterior by a camming surface, circumferentially spaced bearingelements in said radial slots each bounded at its exterior side by a camming surface engaged against the camming surface at the exterior of a corresponding radial slot and an interiorly facing bearing surface of part-cylindrical configuration disposed longitudinally of said cage and means for adjusting said bearing elements longitudinally and interiorly and exteriorly of said cage, there being clearance openings between the bearing elements of each of said bearings extending longitudinally through the corresponding cage in contiguous relation to its central passageway.

3. In a machine for centering and alining with respect to each other a connecting rod bearing to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, a first supporting unit on said frame including portions for removably receiving a first locating element for insertion through a bearing of said connecting rod other than a bearing to be rebored, spaced second and third. supporting units on said frame, and alined bearings on said second and third supporting units, respectively, adapted selectively to removably receive a second locating element or a boring bar for insertion through a bearing to be rebored of said connecting rod while situated between said second and third supporting units, each of said bearings including a hollowed out cage having a longitudinally extending central passageway and radial slots disposed outwardly of and in contiguous relation to said central assageway, circumferentially spaced bearing elements in said radial slots having interiorly facing bearing surfaces of part-cylindrical configuration disposed longitudinally of said cage and means for adjustingsaid bearing elements interiorly and exteriorly of said cage. there being clearance openings between the bearing elements of each of said bearings extending longitudinally through the corresponding cage in contiguous relation to its central passageway.

4. In a machine for centering and alining with respect to each other a connecting rod bearing to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, a first supporting unit on said frame including portions for removably receiving a first locating element for insertion through a bearing of said connecting rod other than a bearing to be rebored, spaced second and third supporting units on said frame, and alined bearings on said second and third supporting units, respectively, adapted selectively to removably receivea second locating element or a boring bar for insertion through a bearing to be bored of said connecting rod while situated between said second and third supporting units, each of said bearings including 9, hollowed out cage having a longitudinally extending central passageway and radial slots disposed outwardly of and in contiguous relation to said central passageway each bounded at its exterior bya camming surface, circumferentially spaced bearing elements in said radial slots each bounded at its exterior side by a camming surface engaged against the camming surface at the exterior of a corresponding radial slot and an interiorly facing bearing surface of part-cylindrical configuration disposed longitudinally of said-cage and means for adjusting said bearing elements longitudinally and interiorly and exteriorly of said cage, there being clearance openings between the bearing elements of each of said bearings extending longitudinally through the corresponding cage in contiguous relation to its central passageway.

5. ma machine for centering and alining with respect to each other a connecting rod bearing to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, supporting units on said frame, and alined bearings on said supporting units, respectively, adapted selectively'to removably receive a locating rod or a boring bar for insertion through a bearing to be rebored of said connecting rod while situated between said supporting units, each of said bearings comprising an annular member, an element rigid with said annular member roviding an interiorly facing, arc shape bearing surface, a, cage within said annular member having an exteriorly facing, arc shape bearing surface engaged with the arc shape bearing surface provided by said element, a retaining element supported by said annular member in spaced relation to said element providing an interiorly facing, arc shape bearing surface engaged with acreage the arc shape bearing :surface zprovided. by said cage'iand Fspaced part-cylindrical bearing surfaces. supported by an interioriportionpof said cage, there 'being vclr'e arancewopenings between the spaced part-cylindrical bearing surfaces of each of said bearings extending lcmgitudinal t through thecorrespondingcage in contiguous relation toja central passageway v:therethrough.

.6; Ina machine for centering and :alining with respect to each other a connecting rod bearin to be rebored and a boring bar withappropriate tool :for reboring said bearing, a frame, a first supporting unit on said frame including portions :for'removably receivinga first locating element for insertion through a bearing .of said connecting-rod other-Ghana bearingto berreboredspaced second and third supporting units on said frame, and alined bearings on said second and third supporting units, respectively, adapted selectively to 'removablyreceive .a second locating element or a boring bar. for insertionlthrongha bearing .to

t be rebored of said connecting rod while :situated between said second and third supporting ,units, :each' ofsaid bearings iicomprising an annular -meinber,- an element rigid with said annular member providing 'an interiorly facing, taro-shape bearing surface, a cage withinsaid annular memher having an eXteriorly facing, :arc shape hearing surface engaged with the arc shape bearing surface provided by said element, a retain-ing elemena'supported' by saidnannular- :member in spaced relation to said element 'sprovidi-ngan interiorly facing, arc-shape bearing surface engagedwith thewarc shape bearing surface pro vided' :by said :cage and spaced "part -cylindrical bearingsurf aces supported by an interior portion of said caga'there being clearance openin s between the :spacefd part-cylindrical bearing .surfaces. of each of said bearings extending longitudinally -'through.;ythe corresponding :cage in contiguous relation to v a central passageway thereof. i u

7'. Ina machine for centering-and .alining with "respect to ea'chiot-her. a connectin 11 11 be rin be rebored. and a boring bar with appropriate *tool for reboring said bearing, a frame, supporting units on said frame, and ialinedbearings son said --supporting units, respectively; adapted selectively toremovably receive a locating rod :or .a boring :barfor insertion :througha bearing to be :rebored I of said connecting rod "while situated between said supporting units, each of saidjoearingsicomprising an annular member,telementsirigid-zwith said annular member :providingzspaced interiorly facing bearing surfaces ofwpart-ispherical 10.01'1- figuration, a page within said annular member havingqspaiced exteriorly-facing bearing surfaces of part-spherical configuration engaged wit-h'the bearing surfaces, respectivelmzof part-spherical configuration. provided bysaidelements, a retaining element supported by 'saidiannular member in spaced relation to said elementsprovidingspaced interiorly facing ibearingsurfacfes .of part-spherical confi r ti a ed with the bearin surfaces, respectively, of part-spherical :configuration provid by s d-c e, -.an bearin elements-rigidwith interior portions of said ca e providin c r m n allv spa ed par -cylindrical-bearing surfaces, there i -being clearance "openings between and-contiguous -with-thepartcylindr al bearin s aces of -.each .of sa bearings extending longitudinally through the correspondingcage; I

s .8. Gina-machine.foricentertn aandzaiming with respect toeach-othera-connecting rodbearing to 57,5

14 be rebor'ed and a boring bar with appropriate tool for reboring said bearing, a frame, a first supporting unit on said frame including portions for removablyv receiving a first locating element for insertion through a bearing of sail connecting rod other than a bearing to be rebored, spaced second and third supporting units on said frame, and alined bearings on said second and third supportingunits, respectively, adapted selectively to removably receive a second locating element or a boring bar for insertion through a bearing to be rebored of said connecting rod Whilesituated'between said second and third supporting units, each of said bearings comprising an annular member, elements rigid with said annular member providing spaced interiorly facing bearing surfaces of part-spherical configuration, a cage within said annular member having'spaced exteriorly facing bearing surfaces of part-spherical configuration engaged with the bearing surfaces, respectively, of part-spherical configura- :tion provided by said elements, a retaining-ele ment supported by :said annular member in spacedr'elation to said elements providing spaced interiorly facing bearing'surfaces of part-spherical configuration engaged with the bearing surfaces, respectively, of part-spherical configuraxtioniprovidedby said cage, andbearing elements rigid withinterior portionsof said cage'providing circumferentially spaced, part-cylindrical bearing surfaces, there being clearance openings between and contiguous with the part-cylindrical bearing surfaces of each of said bearings extending longitudinally through the corresponding cage.

9. Ina machine for centering and alining with respect to each other a connecting rod bearing to be rebored and a boring bar with appropriate tool for lreboring said bearing, a frame, supporting'units on said frame and alined bearings on said supporting units, respectively, adaptedselectively'toxremovably receive a locating element or a boring bar for'insertion through a bearing to be rebored of said connecting .rodwhile situated between said'supporting units, :each of said bearings comprising an annular member, elements .rigid with said annular member providing interiorly facing bearing surfaces of partespherical configuration lying in a single spherical surface and in a plane perpendicularto the longitudinal axis .of :said annular member and spaced apart circumferentially about the annular 'member, a cage .within the annular member having exteriorly facing bearing surfaces of part-spherical configuration lying in a-single spherical surface and in a plane perpendicular :to the longitudinal axis of said cage and spaced apart circumferentially about the cage and engaged with the bearing surfaces, respectively, :of part-spherical configuration provided by said elements, a re.-

taini-ng element supported by said:annular.mem-

faces of each of said bearings extending longitudinally through the corresponding cage.

10. In a -machine for centering and alining with respect to eachother a connecting rod bearing to be rebored and a boring bar with appropriate tool for reboring said bearing, a frame, a first supporting unit on said frame including portions for removably receiving a first locating element for insertion through a bearing of said connecting rod other than a bearing to be rebored, spaced second and third supporting units on said frame, and alined bearings on said second and third supporting units, respectively, adapted selectively to removably receive a second locating element or a boring bar for insertion through a bearing to be rebored of said connecting rod while situated between said second and third supporting units, each of said bearings comprising an annular member, elements rigid with said annular member providing interiorly facing bearing surfaces of part-spherical configuration lying in a single spherical surface and in a plane perpendicular to the longitudinal axis of said annular member and spaced apart circumferentially about the annular member, a cage within the annular member having exterior facing bearing surfaces of part-spherical configuration lying in a single spherical surface and in a plane perpendicular to the longitudinal axis of said cage and spaced apart circumferentially about the cage and engaged with the bearingsurfaces, respectively, of part-spherical configuration provided by said elements, a retaining element supported by said annular member providing interiorly facing bearing surfaces of part-spherical configuration lying in a single spherical surface and in a planeperpendicular to the longitudinal axis of said retaining element and spaced apart circumferentially about'the retaining element and engaged with the bearing surfaces, respectively, of part-spherical configuration provided by said cage in spaced relation to said bearing surfaces of part-spherical configuration provided by said elements, and bearing elements rigid with interior portions of said cage providing spaced part-cylindrical bearing surfaces, there being clearance openings between and contiguous with the part-cylindrical bearing surfaces of each of said bearings extending longitu dinally through the corresponding cage.

11. In a machine for centering and alining with respect to each other a connecting rod bearing to be rebored and a boring bar with appropriate tool for rebcring said bearing, a frame, a vertical slide column rigid therewith, a tubular element adjustable longitudinally of said slide column, means forsecuring said tubular element in fixed relation to said slide column, a supporting member pivotally mounted upon said tubular element for adjustable swinging V movement in a vertical plane, a device for securing said supporting member in fixed relation to said tubular. element, a seat upon said supporting member in spaced relation to said slide column for removably receiving a locating element for insertion through a bearing of said connecting rod other than a bearing to be rebored, and a retainer upon said supporting member adapted to be releasably engaged with a surface of a locating element upon said seat opposite a surface engaged against the seat.

12. In a machine for centering and alining with respect to each'other a connecting rod bearing to be rebored and a boring bar with appropriate tool for re'boring said bearing, a frame,

'a vertical slide column rigid therewith, a tubusupporting member constituted as a U-shape frame including spaced, parallel arms at opposite sides of said tubular element pivotally mounted thereon for adjustable swinging movement in' a vertical plane and a base element between said parallel arms in spaced relation to the tubular element, a device for securing said supporting member in fixed relation to said tubular element, alined part-cylindrical seats upon said parallel arms in spaced relation to the tubular element opposite said base element for removably receiving a locating element for insertion through a bearing of said connecting rod other than a bearing to be rebored, and retainers upon said supporting member adapted to be releasably, removably engaged With surfaces of a locating element upon said part-cylindrical seats opposite surfaces engaged against the part-cylindrical seats.

13. In a machine of the character described, a first member providing a relatively large partcylindrical seat forremovably receiving a relatively large locating element, a second member providing a comparatively smaller part-cylindrical seat for removably receiving a, comparatively smallerlocating element and a part-cylindrical seating surface opposite said comparatively smaller part-cylindrical seat for engagement against said relatively large part-cylindrical seat provided by said first member, means for detachably securing said second member upon said first member with said part-cylindrical seating surface provided by the second member and the relatively large part-cylindrical surface provided by the first member in engagement and said comparatively smaller part-cylindrical seat at the inner side of said relatively large part-cylindrical seat, and a retainer upon said first member adapted selectively to be releasably engaged with either a surface of said relatively large locating element when upon said relatively large partcylindrical sea-t opposite a surface engaged against the relatively large part-cylindrical seat or a surface of said comparatively smaller 10- cating element when upon said comparatively smaller part-cylindrical seat opposite a surface engaged against the comparatively smaller partcylindrical seat;

14. In a machine of the character described, first members providing alined relatively large part-cylindrical seats for removably receiving a relatively large locating element, second members providing alined comparatively smaller part-cylindrical seats for removably receiving a comparatively smaller locating element and part-cylindrical seating surfaces opposite said comparatively smaller part-cylindrical seats for engagementagainst said relatively large part-cylindrical seats, respectively, provided by said first members, means for detachably securing said second members upon said first members with said partcylindrical seating surfaces provided by the second member and the relatively large part-cylindrical seats provided by the first member in engagement and said comparatively smaller partcylindrical seats at the inner sides of said relatively large part-cylindrical seats, respectively, and retainers upon said first members adapted selectively to be releasably, removably engaged with either surfaces of said relatively large locating element when upon said relatively large part- 17 cylindrical seats opposite surfaces engaged against the relatively large part-cylindrical seats or surfaces of said comparatively smaller locating element when upon said comparatively smaller part-cylindrical seats opposite surfaces engaged against the comparatively smaller partcylindrical seats.

15. In a machine of the character described, a first member providing a relatively large partcylindrical seat for removably receiving a relatively large cylindrical element, a second member providing a comparatively smaller part-cylindrical seat forremovably receiving a comparatively smaller cylindrical element, a retainer upon saidfirst member adapted selectively to removably engage either a surface of said relatively large cylindrical element when upon said relatively large part-cylindrical seat opposite 'a surface engaged against the relatively large part-cylindrical seat or a surface of said comparatively smaller cylindrical element when upon said comparatively smaller part-cylindrical seat opposite a. surface engaged against the comparatively .file of this patent:

smaller part-cylindrical seat, and means for releasably locking said retainer in engaged 'rela tion with either said relatively large or said comparatively smaller cylindrical element.

16. The combination as specified in claim' 15 wherein said second member is mounted upon said first member for movement of rotation of said retainer toward and away from said relatively large and comparatively smaller part-cylindrical seats.

EWALD A. ARP. REFERENCES CI IED I The following references are of i'ecord 'in the UNITED STATES PATENTS 

